Polymerization of bis(triethoxysilyl)ethenes. The impact of substitution geometry on the formation of ethenyl- and vinylidene-bridged polysilsesquioxanes
- Sandia National Labs., Albuquerque, NM (United States). Dept. of Encapsulants and Foams
- Univ. of California, Irvine, CA (United States). Dept. of Chemistry
Preparation of organically-bridged polysilsesquioxanes has been achieved by polymerizing organic monomers with two or more trialkoxysilyl groups per monomer repeat unit. The nature of the organic bridging group has been shown to strongly impact the final properties (surface area, pore size, and thermal stability) of the end product. For example, rigid arylene bridging groups have been shown to give rise to materials with high surface areas with a relatively large contribution from micropores (< 20 {angstrom}). The length of alkylene-bridging groups can be used to control the size and dispersity of pores in hydrocarbon-bridged xerogels. In this study, the authors have examined the preparation of ethylene-bridged polysilsesquioxanes from the E-(1) and Z-(2) isomers of 1,2-bis(triethoxysilyl)ethene and vinylidene-bridged polysilsesquioxanes from 1,1-bis(triethoxysilyl)ethene-(3). This study was intended to determine the effects of substitution geometry about the carbon-carbon double bond on the condensation chemistry of the monomers and on the resulting architectures of the final materials.
- Research Organization:
- Sandia National Labs., Dept. of Encapsulants and Foams, Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Financial Management and Controller, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 656533
- Report Number(s):
- SAND-98-0539C; CONF-980314-; ON: DE98003932; BR: YNO100000; TRN: AHC29817%%89
- Resource Relation:
- Conference: American Chemical Society (ACS) meeting, Dallas, TX (United States), 26 Mar - 2 Apr 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of bridged polysilsesquioxane xerogels prepared from methoxy-, ethoxy-, and propoxy-silyl monomers
Comparison of bridged polysilsesquioxane xerogels prepared from methoxy- and ethoxy-silyl monomers